Speed increaser planet carrier and planet shaft matching structure

Abstract

The application discloses a speed increaser planet carrier and planet shaft cooperation structure, relates to the technical field of speed increaser planet carriers, and aims to solve the technical problem of planet shaft and planet shaft hole jamming caused by temperature rise during assembly of planet carrier components in the prior art. In the speed increaser planet carrier and planet shaft cooperation structure, the planet shaft adopts a three-section stepped shaft structure; the three-section stepped shaft structure is integrally formed from bottom to top by a first section shaft body, a second section shaft body and a third section shaft body, the shaft diameter d1 of the first section shaft body is smaller than the shaft diameter d2 of the second section shaft body, and the shaft diameter d2 of the second section shaft body is smaller than the shaft diameter d3 of the third section shaft body; the planet carrier has a three-section stepped shaft hole structure; the three-section stepped shaft hole comprises first, second and third shaft holes which are sequentially arranged from bottom to top, and the hole diameter D1 of the first shaft hole is smaller than the hole diameter D2 of the second shaft hole, and the hole diameter D2 of the second shaft hole is smaller than the hole diameter D3 of the third shaft hole.

Description

Technical Field

[0001] This utility model relates to the field of speed increaser planetary carrier technology, and in particular to a speed increaser planetary carrier and planetary shaft mating structure. Background Technology

[0002] Currently, wind energy is one of the world's most abundant renewable energy sources, and wind power generation has naturally become a favorite in the energy industry. As a core component of wind power generation, the speed increaser occupies an important position in the wind power industry. The speed increaser mainly relies on gear sets to amplify the input speed many times before inputting it to the generator to generate electricity. In the assembly and manufacturing process of the speed increaser, the assembly of the planetary shaft and planetary carrier has always been a difficult problem that has plagued the industry.

[0003] The planetary shaft and planetary carrier have an interference fit, and the interference is relatively large. Conventional press-fitting methods cannot meet the assembly requirements. The industry usually adopts cold fitting: cold fitting means placing the planetary shaft in liquid nitrogen. The liquid nitrogen freezes the planetary shaft to a certain temperature, causing the planetary shaft to shrink and the shaft diameter to become smaller. This changes the shaft-hole fit from an interference fit to a clearance fit. A crane is then used to align and assemble the frozen and shrunken planetary shaft and planetary carrier into place.

[0004] However, the above method has a problem: due to the long assembly stroke of the planetary carrier bore and planetary shaft, the planetary shaft experiences a large temperature rise and the journal enlarges during assembly, increasing the likelihood of contact between the planetary shaft and the planetary carrier. Once contact occurs, rapid heat transfer causes a sudden drop in the planetary carrier temperature, leading to shrinkage of the planetary carrier bore and causing the planetary shaft to jam, preventing further assembly and resulting in rework, thus increasing the assembly difficulty. Currently, there is no complete solution to this problem in the industry. The only recourse is to use tools to remove the planetary shaft when jamming occurs, immerse it in liquid nitrogen for further cooling, and then attempt to assemble it again.

[0005] Therefore, how to provide a planetary carrier and planetary shaft mating structure for a speed increaser that can effectively improve the assembly efficiency of the planetary shaft and reduce the assembly rework rate, thereby effectively reducing the probability of planetary shaft jamming during the assembly process, has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this utility model is to provide a planetary carrier and planetary shaft mating structure for a speed increaser, which solves the technical problem of planetary shaft and planetary shaft hole jamming caused by temperature rise during the assembly of the planetary carrier component in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A planetary carrier and planetary shaft mating structure for a speed increaser includes: a planetary shaft, wherein the planetary shaft adopts a three-section stepped shaft structure; the three-section stepped shaft structure is integrally formed from a first section shaft body, a second section shaft body, and a third section shaft body from bottom to top, wherein the shaft diameter d1 of the first section shaft body is smaller than the shaft diameter d2 of the second section shaft body, and the shaft diameter d2 of the second section shaft body is smaller than the shaft diameter d3 of the third section shaft body; The planetary carrier has a three-stage stepped shaft hole structure; the three-stage stepped shaft holes include a first shaft hole, a second shaft hole and a third shaft hole distributed sequentially from bottom to top, and the diameter D1 of the first shaft hole is smaller than the diameter D2 of the second shaft hole, and the diameter D2 of the second shaft hole is smaller than the diameter D3 of the third shaft hole.

[0008] In practical applications, the diameter difference between adjacent stepped shafts in the planetary axis is 1~5mm.

[0009] The three-segment stepped shaft structure is either a cylindrical stepped shaft, a conical stepped shaft, or a square stepped shaft.

[0010] Compared with the prior art, the planetary carrier and planetary shaft mating structure of the speed increaser described in this utility model has the following advantages: The planetary carrier and planetary shaft mating structure of the speed increaser provided by this utility model features a three-section stepped shaft structure for the planetary shaft. This structure is integrally formed from a first shaft section, a second shaft section, and a third shaft section, with the shaft diameter d1 of the first shaft section being smaller than the shaft diameter d2 of the second shaft section, and the shaft diameter d2 of the second shaft section being smaller than the shaft diameter d3 of the third shaft section. Simultaneously, the planetary carrier has a three-section stepped shaft hole structure. This structure includes a first shaft hole, a second shaft hole, and a third shaft hole, distributed sequentially from bottom to top, with the diameter D1 of the first shaft hole being smaller than the diameter D2 of the second shaft hole, and the diameter D2 of the second shaft hole being smaller than the diameter D3 of the third shaft hole. Therefore, it enables… The first stepped shaft (d1 dimension) and the second stepped shaft (d2 dimension) of the planetary shaft can easily pass through the planetary carrier shaft hole D3 on the upper part of the planetary carrier. The clearance between the second section of the planetary shaft diameter after liquid nitrogen freezing and the inner diameter of the planetary carrier shaft hole is also 0.1mm~0.2mm, which also requires alignment and assembly. However, it is assumed that the actual assembly start position of this stepped shaft structure is the overlapping surface of the second section of the planetary shaft (d2 dimension) and the upper end face of the planetary gear component. Its overall stroke is shortened by about 1 / 3 compared with the assembly stroke in the prior art, thereby effectively reducing the assembly time, thus effectively reducing the temperature rise of the planetary shaft during the assembly process, and effectively improving the first-time assembly success rate, reducing rework and waste. Attached Figure Description

[0011] Figure 1 A cross-sectional structural schematic diagram of the planetary carrier and planetary shaft mating structure of the speed increaser provided in an embodiment of this utility model; Figure 2 A cross-sectional view of the planetary shaft in the planetary carrier and planetary shaft mating structure of the speed increaser provided in this embodiment of the utility model; Figure 3 This is a cross-sectional view of the planetary carrier in the planetary carrier and planetary shaft mating structure of the speed increaser provided in this embodiment of the utility model.

[0012] Figure label: 1-Planetary axis; 11-First axis section; 12-Second axis section; 13-Third axis section; 2-Planetary carrier; 21-First shaft hole; 22-Second shaft hole; 23-Third shaft hole; 3-Planetary gear assembly; 4-Assembly start position. Detailed Implementation

[0013] The planetary gear assembly is mounted on the planetary carrier by a planetary shaft. The upper and lower shaft holes of the planetary carrier, the bearing inner holes of the planetary gear assembly, and the planetary shaft are all interference fit. During the planetary shaft assembly process, the planetary carrier and the planetary gear assembly (composed of bearings and planetary gears) need to be fixed. After the planetary shaft is cooled by liquid nitrogen, it is lifted, aligned with the shaft hole of the planetary carrier, and then lowered into place.

[0014] The existing cylindrical shaft structure design results in an interference fit between the lower end of the planetary shaft and the shaft hole on the planetary carrier. Even though the planetary shaft undergoes freezing shrinkage in liquid nitrogen and has a certain gap with the shaft hole on the planetary carrier, this gap is only 0.1mm~0.2mm. Alignment is required before assembly. Therefore, we assume that the assembly starts at the coincidence of the lower end face of the planetary shaft and the end face of the shaft hole on the planetary carrier. The overall assembly stroke is relatively long, and the planetary shaft's descent process takes a long time. The planetary shaft experiences a significant temperature rise during assembly, which often causes the planetary shaft to jam or seize with the shaft hole when the assembly is about halfway through the stroke. This makes assembly difficult, and the planetary shaft can only be pulled out using tooling. It then needs to be cooled in liquid nitrogen to the required process temperature before reassembling. This results in a waste of manpower and resources. Improper operation during the planetary shaft removal process can also damage the cylindrical surface of the planetary shaft, which may even lead to the planetary shaft being scrapped.

[0015] For ease of understanding, the following description, in conjunction with the accompanying drawings, details the planetary carrier and planetary shaft mating structure of the speed increaser provided in this embodiment of the invention.

[0016] This utility model embodiment provides a speed increaser planetary carrier and planetary shaft mating structure, such as Figure 1As shown, it includes: a planetary shaft 1, and the planetary shaft 1 adopts a three-section stepped shaft structure; the three-section stepped shaft structure is integrally formed from the first section shaft body 11, the second section shaft body 12 and the third section shaft body 13 from bottom to top, and the shaft diameter d1 of the first section shaft body 11 is smaller than the shaft diameter d2 of the second section shaft body 12, and the shaft diameter d2 of the second section shaft body 12 is smaller than the shaft diameter d3 of the third section shaft body 13; Planetary carrier 2, and planetary carrier 2 has a three-stage stepped shaft hole structure; the three-stage stepped shaft holes include a first shaft hole 21, a second shaft hole 22 and a third shaft hole 23 distributed from bottom to top, and the diameter D1 of the first shaft hole 21 is smaller than the diameter D2 of the second shaft hole 22, and the diameter D2 of the second shaft hole 22 is smaller than the diameter D3 of the third shaft hole 23.

[0017] Compared with the prior art, the planetary carrier and planetary shaft mating structure of the speed increaser described in this embodiment of the invention has the following advantages: In the planetary carrier and planetary shaft mating structure of the speed increaser provided in this embodiment, the planetary shaft 1 adopts a three-section stepped shaft structure. The three-section stepped shaft structure is integrally formed from bottom to top by a first section shaft body 11, a second section shaft body 12, and a third section shaft body 13. The shaft diameter d1 of the first section shaft body 11 is smaller than the shaft diameter d2 of the second section shaft body 12, and the shaft diameter d2 of the second section shaft body 12 is smaller than the shaft diameter d3 of the third section shaft body 13. At the same time, the planetary carrier 2 has a three-section stepped shaft hole structure. The three-section stepped shaft hole includes a first shaft hole 21, a second shaft hole 22, and a third shaft hole 23 distributed from bottom to top. The diameter D1 of the first shaft hole 21 is smaller than the diameter D2 of the second shaft hole 22, and the diameter D2 of the second shaft hole 22 is smaller than the diameter D3 of the third shaft hole 23. The bore diameter D3 is 23; therefore, the first stepped shaft (d1 dimension) and the second stepped shaft (d2 dimension) of the planetary shaft 1 can easily pass through the planetary carrier shaft hole D3 on the upper part of the planetary carrier 2. After being frozen with liquid nitrogen, the gap between the second section of the planetary shaft 1 and the inner diameter of the shaft hole of the planetary carrier 2 is also 0.1mm~0.2mm, and alignment assembly is also required. However, it is assumed that the actual assembly start position 4 of this stepped shaft structure is the overlapping surface of the second section (d2 dimension) of the planetary shaft 1 and the upper end face of the planetary gear component 3. Its overall stroke is shortened by about 1 / 3 compared with the assembly stroke in the prior art, thereby effectively reducing the assembly time, thus effectively reducing the temperature rise of the planetary shaft during the assembly process, and effectively improving the first-time assembly success rate, reducing rework and waste.

[0018] In practical applications, such as Figure 2 As shown, the diameter difference between adjacent stepped shafts in the planetary shaft 1 can preferably be 1~5mm; if the step transition difference is too small, the assembly gap will also be very small, which will not facilitate assembly; if the difference is too large, it may cause local stress concentration in the planetary shaft, leading to failure and breakage of the planetary shaft during operation.

[0019] The three-segment stepped shaft structure can be a cylindrical stepped shaft, a conical stepped shaft, or a square stepped shaft.

[0020] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A planetary carrier and planetary shaft mating structure for a speed increaser, characterized in that, include: The planetary shaft adopts a three-section stepped shaft structure; the three-section stepped shaft structure is integrally formed from the first section shaft body, the second section shaft body and the third section shaft body from bottom to top, and the shaft diameter d1 of the first section shaft body is smaller than the shaft diameter d2 of the second section shaft body, and the shaft diameter d2 of the second section shaft body is smaller than the shaft diameter d3 of the third section shaft body. The planetary carrier has a three-stage stepped shaft hole structure; the three-stage stepped shaft holes include a first shaft hole, a second shaft hole and a third shaft hole distributed sequentially from bottom to top, and the diameter D1 of the first shaft hole is smaller than the diameter D2 of the second shaft hole, and the diameter D2 of the second shaft hole is smaller than the diameter D3 of the third shaft hole.

2. The planetary carrier and planetary shaft mating structure of the speed increaser according to claim 1, characterized in that, The diameter difference between adjacent stepped axes in the planetary axis is 1~5mm.

3. The planetary carrier and planetary shaft mating structure of the speed increaser according to claim 1 or 2, characterized in that, The three-segment stepped shaft structure is a cylindrical stepped shaft, or a conical stepped shaft, or a square stepped shaft.

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